ICD-10-CM 2027
ICD-10 code for neuroendocrine tumor
From the official ICD-10-CM alphabetic index entry “Tumor › neuroendocrine”. Page updated September 29, 2026.
About coding neuroendocrine tumor
The ICD-10-CM code for neuroendocrine tumor is C7A (Malignant neuroendocrine tumors). The official index lists 3 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on C7A.
To report this condition, pick the subcode that matches the documentation: C7A.0 (tumors), C7A.1 (tumors) and C7A.8 (tumors).
The conditions in its Excludes2 note aren't part of C7A, but may be coded alongside it if the patient has both: malignant pancreatic islet cell tumors (C25.4) and Merkel cell carcinoma (C4A.-).
Use an additional code to identify any associated endocrine syndrome, such as: carcinoid syndrome (E34.00).
More specific neuroendocrine tumor codes (official index)
Common questions about neuroendocrine tumor ICD-10 codes
What is the ICD-10 code for neuroendocrine tumor?
- C7A — Malignant neuroendocrine tumors (a header code; report a more specific subcode). More specific codes apply when the documentation supports them: C7A.1, C7B.8, C7A.8.
What is the ICD-10 code for malignant poorly differentiated neuroendocrine tumor?
- C7A.1 — Malignant poorly differentiated neuroendocrine tumors.
What is the ICD-10 code for secondary nec neuroendocrine tumor?
- C7B.8 — Other secondary neuroendocrine tumors.
Is C7A billable?
- No. C7A is a header code. Report one of its more specific subcodes instead.